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NBME 21 Answers
A 47-year-old man is brought to the emergency ...
Mixed venous oxygen tension
A helpful equation is CO=rate of O2 consumption/(arterial O2 content-venous O2 content): Fick principle
If CO is decreased, then the difference between arterial O2 content and venous O2 content is increased
no, decreased CO => peripheral vasoconstriction => SVR will be increased
No SVR will increase due to RAAS and SAN thats why we decrease afterload in HF treatment ( ACEI, ARBs )
Wouldn't pulmonary vascular resistance also be decreased here due to pulmonary vasodilation in the setting of an MI?
@snafull: my initial thought is that we would see pulmonary vasoconstriction because of the relatively low oxygen tension (that results from the low cardiac output).